What is the first degree expression to be subtracted from \( x^{6}+8 x^{4}+2 x^{3}+16 x^{2}+4 x+...

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What is the first degree expression to be subtracted from \( x^{6}+8 x^{4}+2 x^{3}+16 x^{2}+4 x+5 \) in order to make it a perfect square?
(a) \( -4 x-4 \)
(b) \( 4 x+4 \)
(c) \( 4 x-4 \)
(d) \( -4 x+4 \)
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